Four independent engineer quadrocopters D'Andrea, have managed to build a 6-meter tower from 1500 elements. Their work was coordinated the computer, without any human intervention. Each flying boat getting exact coordinates for the installation of blocks and self recharge the batteries went when it was required. As it turned out, built structure is a model project, the so-called "vertical village" on a scale of 1:100. Its height is 600 meters and a population of 30 000 people. Each "brick" will be a residential apartment, a cinema or shop, and a system of fast lifts will move between the farthest points of the building for 7 minutes.